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Lam man No. 79,171, ma .new 2s, isos.

IMPROVEMENT IN HARVESTER DRIVING-WHEELS,

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TO ALL WHOM IT MAY CONOERN:

Be it known that we, WILLIAM N. Wul'rnnnv and THOMAS Hnnnrue, of Springfield, in the county of-Clark, and State of Ohio, have invented a new and useful Improvement in Adjustment for Harvesters Driving-Wheels, Snc.; and we do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, in whichl Figure 1 is a side. elevation of a part of a harvesting-machine, showing the operation of our invention..

Figure 2 shows in elevation the axle of the driving-wheel detached,

Figure 3 is a vertical longitudinal section through hub and axle.

This invention consists in making the spindle or axle of a gear-wheel adjustable upon 'a centre, eccentric to the axis of said spindle, so. that by turning said spindle upon said centre, the axis of the spindle may be changed in position, and. the meshof the gear-wheel with its pinion may be adjusted.

4In the drawings and description, this device is represented as attached to a harvesting-machine, but we do not intend to limit ourselves to its usein' connection with those machines, nor to the precise details of construction herein shown and described, as it will appear evident that they may be greatly changed 'without departing from-the spirit of our invention.

That others may understand the construction and operation of ,this invention, we will particularly describe it.

A is the nmiu wheel of a harvester, and B is the gear-ring, cast with it, or cast separately and afterwards fitted and` securedto the spokes of the wheel A. Owing to well-known reasons, castings made from the same pattern will seldom be of equal size when cold, und this variationl in such castings' as harvesters driving-wheels is suilicient to alfect the mesh and working of the gears materially, and it is necessary either to let thel machines go out with this imperfection, or to provide some modeof compensation. `It` is not convenient to gauge the distances for the centres of the lshafts in every case, and ii`- this should he done, the wheels could never be interchangeable, and it is costly to construct adjustable boxes for the bearings, as well as inconvenient to the user. Wo therefore construct the hollow axle C, in such a manner that the hollow through which the clampingbolt D passes, shall be a little eccentric to the cylindrical outer surface of said axle, upon which the wheel .A runs.` A iiange, surrounds the base of this ax1e.to give it asti-ong and steady bearing upon the surface of the couplingarm F, and a slightly projecting stud, I, concentric with the clamping-holt D, vlits int-o a corresponding socket in the face of the coupling-arm, to give the axle a constant and truc centre, withoutwdepcnding uponthe bolt D for that purpose. The flange E is concentric with the stud I, and in its edge we make a number of notches, G, and at a proper point on the surface of the coupling-arm, we fix a pin, H, so lthat itmay engage with either one of said notches. Now, when the wheel A is to be put in place, the axle C is turned around on the holt D, untilthe teeth of the wheel B engage properly with the teeth of its pinion, and the nearest notch G is then brought to the pin H, and the axle is secured in that position. The red lines in the drawings fully illustrate the change in the distance between the centres of the wheel anchp'inion which can readily be produced by thisarrangetnent.

If at any time it is necessary to change wheels, or to replace an old one with a new one, it will he necessary to change this adjustment, and the farmer or attendant can always effect it without trouble, and in the manufactory it will beof the `greatest. convenience in adjusting the machines for the market. At present there is very rarely any attempt to secure an adjustment of these parts, and as a consequence-hut few machines in the market are corectly and accurately {itt-ed in that respect.

Having described our invention, what we claim as new, is-f i The eccentric hollow Iaxle C, provided with the stud I, or its equivalent, and the notched ange E in connectinn with apiu, H, socketed coupling-arm I, and holt D, substantially as and for the purpose set forth.

' VWM. N. WHITELEY, THOMAS HARDING.

Witnesses: A l

THOMAS J. PMNGLE,

Guns. ANTHONY. l 

